Rubber mixing, grinding, sheeting, and similar mili



F. .mnou; RUBBER MIXINGyGBINDING, SHEETHNG, AND SIMILAR NHL. APPLICATIONFILED DEC-15141919.

1,342, 114:. Patented 5mm 1 192%,

FREDERICK IDDON, 0F LEYLAND, ENGLAND.

RUBBER MIXING, GRINDING, SHEE'DING, AND SIMILAR M1111 Specification ofLetters Patent.

Patented June 1, 1920..

Application filed December 15, 1919. Serial No. 345,021.

To all whom it may concern .Be it known that I, FREDERICK IDDoN, aBritish subject, residing. at School Lane, Leyland, county of Lancaster,England, have invented certain new and useful Improvements in RubberMixing, Grinding, Sheeting, and Similar Mills, of which the following isa specification.

This invention relates to improvements in the driving of the rollers ofrubber mixing, grinding, sheeting and warming up mills and other millsor apparatus similar thereto.

Two types of such mills are usually employed known as single gearedmills and double geared mills respectively; In the single geared millsthe rollers are driven by one large driving wheel carried on the journalof the back roller, and a wheel carried on the other end of the shaft ofthe back roller gears with a similar wheel carried on the journal of thefront roller. These two wheels may be of the same diameter, in

which case the surface speed of the two rollers would be alike, or'theymay be of unequal diameter, in which case the sur face speed of the tworollers would be unequal, in which case the mills are usually referredto as being friction geared. i

In the double geared mills the rollers are driven by two large drivingwheels carried on the journals of the back and front rollersrespectively and on opposite sides of the mills. The wheel driving theback roller usually engages with a suitable pinion carried on the maindriving shaft, (usually placed underneath the mills) while the wheel.

for driving the front roller engages with a pinion carried on a countershaft running parallel with the main driving shaft and is geared theretoby suitable wheels. The

gear wheels may be of such a size that the.

back and front rollers rotate at thesanie speed or the gearing may besuch that the mill is friction geared, 2'. e. the hack and front rollersrotate at different speeds.

By means of additional gear wheels carried on the main driving shaft andgearing with suitable wheels carried on the counter shaft (the. singlegeared mills require a counter shaft for this purpose) the relativespeeds of the rollers may be changed by means of clutches engaging withthe said wheels. Mills fitted with such change speed wheels are'however, limited in the number of speeds and owing to mechanicald1fiieult'es and complications are seldom provided with more than twospeeds, while at the same time the employment of such change speedwheels and the necessary arrangements for changing the speed areconfined in use to single or individual machines. The purpose and objectof this invention is to provide a means of driving and varying thespeedsof the rollers of rubber mixing, grinding, sheeting, warming up.and similar mills, in a manner unattainable by the ordinary method ofwheel gearing, and which may be also used in driving a single mill orfor driving a multiple number of mills. The invention consistsessentially in driving the front rollers of a single mill or the frontrollers of a series of mills the back rollers of a single mill or theback rollers ofa series of mills from independent variable sourcesso-that the speed ratio between the front and back rollers can be variedto any desired amount.

The invention will be described with reference to the accompanyingdrawings.

Figure 1 is a front elevation of a rubber mill which may be used. forthe purpose of mixing, grinding, sheeting, and warming up.

Fig. 2- is a plan of same.

Fig. 3 is a transverse section of Fig. l.

The source of power consists of two variable speed electric motors A Aeach motor capable of developing approximately one half of the maximumpower that is required and necessary to drive one'mill or series ofmills. Each of the motors A A is provided with a suitable speed reducinggear B B which is shown as double helical spur gears but which may be ofthe worm and worm wheel, straight spur, bevel, .or chain type, or anysuitable combination of these gears.

The motor A. drives the back roller D (or the back rollers of a seriesof mills) through the reduction gears 13 and shaft C on which is carrieda pinion E engaging with the wheel F.

The motor A drives the front roller D (or the front rollers of a seriesof mills) through the reduction gears B and shaft C on-which is carrieda pinion E, engaging with the wheel F.

The motor A and reduction gears B are reduction. gears B are errengedtodrive the roller D (or series of tront rollers} st speeds varying from 5to 15 revolutions per minute, or at any such speeds as may determined orrequired. I

The speeds or" the two motors may be varied by means of suitable speedcontrollers or resistances. An index or dial or other such means ispreferably attached to the controllers whereby the speeds of frontroller or rollers and the speeds of the back roller or rollers arerespectively indicated.

It will be undestood that any such speed controlling device or devicesmust necessarily be placed Within easy reach of the operator, or in thecase Where a. number of machines are in Work the control of the speedswould be under the supervision of en operator depot-ed for this Work.

It will be readily understood that by operating the controller orcontrollers eny speeds may be selected that are Within the limits orrange of the motors A. A. 'For instance, the back roller or rollers mayrun at any speed from 3.0 to 30 R. P. M. While the front roller orrollers roe-y heron at any speed from 5 to 15 P. M. which. represents 9.frictional speed of 6 to 1 (max.- imom) and an even speed of 15(mesiniurn).

The speeds of the rollers referred to above are those in common use inthe rubber tr-ode, but may be altered to suit any special drocessoperations or conditions re 'UUGG.

It Will also be understood that the eponcation of two or more motorswith variable speeds may be used on special mschi res having threerollers used for the purpose oi? shred big see other such duties, w v rethe ratio of speeds a governin factor in the nature of their prodi.

Also in three and our roll celenders woere the limits of trictlonelspeeds are new governed by the relative size of coupling Wheels employedand carried on the ends or" the rollers.

What It claim as m invention and desire to protect by Letters A atentis 1. In a. rubber mixing or similar mill the combination with the frontand back rollers oi: independent variable sources of power, so that thespeed ratio between the front rollers and the beck rollers can be variedto any desired amount.

2. In a series of rubber mixing millsor similar apparatus thecombination with the front and back rollers of the series of independent variable sources of power, so that the speed ratio between thefront rollers and the back rollers can be varied to any desired amount.

lo. a. rubber mixing on similar 'millthe combination with the front andback rollers 01" independent variable electric motors, so

that the speed ratio between the front roll-- ers and the back rollerscan. be varied to any desired amount. 7

4;. In a series of rubber mixing mills or similsr apparatus thecombination with the front and back rollers of the series of independentvariable electric motors, so that the speed ratio between the frontrollers and the back rollers can be varied to any desired amount.

in testimony whereof have hereunto set my hand in presence of twosubscribing witnesses.

FEEDERlCl 'KDDON. W

J. QWDEN WERE-N,

H. UBEIEN.

